WO1988007887A1 - Method for the cleaning of the filter plates in a suction dryer - Google Patents
Method for the cleaning of the filter plates in a suction dryer Download PDFInfo
- Publication number
- WO1988007887A1 WO1988007887A1 PCT/FI1988/000032 FI8800032W WO8807887A1 WO 1988007887 A1 WO1988007887 A1 WO 1988007887A1 FI 8800032 W FI8800032 W FI 8800032W WO 8807887 A1 WO8807887 A1 WO 8807887A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- basin
- ultrasonic
- cleaning
- suction
- filter plates
- Prior art date
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000725 suspension Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 7
- 239000000706 filtrate Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 3
- 238000002604 ultrasonography Methods 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- HCTVWSOKIJULET-LQDWTQKMSA-M phenoxymethylpenicillin potassium Chemical compound [K+].N([C@H]1[C@H]2SC([C@@H](N2C1=O)C([O-])=O)(C)C)C(=O)COC1=CC=CC=C1 HCTVWSOKIJULET-LQDWTQKMSA-M 0.000 claims 1
- 239000000919 ceramic Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/52—Regenerating the filter material in the filter by forces created by movement of the filter element
- B01D33/54—Regenerating the filter material in the filter by forces created by movement of the filter element involving vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/08—Regeneration of the filter
- B01D2201/085—Regeneration of the filter using another chemical than the liquid to be filtered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/28—Position of the filtering element
- B01D2201/282—Filtering elements with a horizontal rotation or symmetry axis
Definitions
- the invention concerns a method in a suction dryer, which comprises a basin for the suspension to be suction-dried, in connection with which said basin one or several disc-shaped components revolve, which consist of filter plates, onto whose faces a filtrate cake is gathered and dewatered by the effect of a suction flow passing through the filter plates, the said filtrate cake/cakes being scraped or otherwise detached from the face or " faces of the filter plates.
- various suction dryers which comprise filter discs composed of finely porous filter plates.
- the said discs are rotated in the sus ⁇ pension to be dewatered, and by the effect of suction, a filtered cake is gathered on the plane faces of the filter plates, which said cake is scraped off the faces of the filter plates.
- the said, usually ceramic, filter plates have a tendency to be blocked, because their pore structure is successively filled with finely divided material.
- a particular object of the present invention is to provide such a method for the cleaning of suction filter plates wherein no substantial alterations have to be made to the suction filter device itself and which said cleaning method can be used smoothly when required, at suitable intervals, so that the natural f nctions and embodiments of equipment of the suction dryer can be utilized efficiently in the cleaning.
- the method in accordance with the invention is mainly characterized in
- an ultrasonic de ⁇ tector or detectors are provided in connection with the basin for the suspension to be filtered, to which said detectors an electric power of ultrasonic frequency is fed out of an ultrasonic generator, - that for the time of the cleaning intensified by ultrasound, the suspension basin is filled with a con ⁇ necting and cleaning liquid, preferably water, and
- Figure 1 is a schematical side view of a suction dryer arranged to be cleaned by means of the method in accordance with the invention.
- Figure 2 shows the same as Figure 1 , viewed from the end of the suction dryer.
- the suction dryer 10 shown in Figures 1 and 2 comprises a frame part 11 and a suspension basin 12 arranged on the frame, the suspension to be dewatered, such as dressed metal ore, peat suspension, or equi- valent, being passed into said basin.
- a horizontal shaft 13 is fitted as revolving on the frame part 11 , said shaft being driven by a motor M by the intermediate of a worm gear 18.
- filter discs 14 in a vertical plane are mounted as fixed, said discs being provided with ceramic filter plates 14a, e.g., of the sort described in the applicant's Finnish Patent Applications Nos. 853963 and 870979.
- the dewatered cakes are scraped off the faces of the plates 14a in the filter discs 14 by means of doctors 20 , whose blades 20a are placed one opposite the other, as is shown in Fig. 1, on both of the opposite active faces of the filter plates 14a.
- the blades 20a of the doctors 20 are connected by means of intermediate arms to guides 19, by whose intermediate the doctor blades 20, placed in pairs one opposite the other, are loaded with an appropriate force.
- a 5 cleaning system in accordance with the invention is pro ⁇ vided for the filter plates 14a of the discs 14, pref r ⁇ ably ceramic, finely porous filter plates.
- the cleaning system includes ultrasonic detectors 30 , which are permanently connected to the sub-bottom of the basin 12
- connection 35 may.also start, via which the opera ⁇ tion of the motor M rotating the filter discs 14 and possibly the operation of other devices, such as the magnetic valve 21 of the cleaning-water pipe 22, are controlled, through which said pipe 22 clean, warm
- the devices controlled via the connection 35 of the control unit 33 may also include the water supply means, by means of which, through a distributor piece 16 and pipes 15, the recirculation of the cleaning water
- the cleaning method in accord ⁇ ance with the invention is accomplished, e.g., as follows.
- the suspension basin 12 is emptied of the suspension to
- the ultrasonic generator 32 is started by means of the con ⁇ trol unit 33, and a sufficiently intensive field of ultrasonic oscillation is applied to the ceramic plates 14a or equivalent on the revolving filter discs 14 by means of the detectors 30.
- the cleaning water present in the basin 12 acts as the connecting liquid for the ultrasonic field, which said water spreads the field of oscillation efficiently to the filter plates 14a' while they revolve at the same time, so that the cleaning effect can be spread uniformly over all the plates 14a on the discs 14.
- cavitation and implosion are produced in the cleaning liquid present in the basin 12, which produce an efficient deep-cleaning effect on the faces of the filter plates 14a to be cleaned. Cavitation depends on surface tension. If necessary, the cavitation is in ⁇ creased by raising the temperature of the water present in the basin and/or by using washing agents.
- the frequency of the ultrasonic energy supplied through the conductor 31 is, as a rule, of an order of 15 to 300 kHz.
- the detectors 30, which are preferably placed symmetrically at both sides of the vertical centre plane of the basin, are, e.g., agnetostrictive, piezo ⁇ electric or equivalent oscillators, which are arranged to operate, e.g., at or near the resonance frequency.
- a suitable power of ultrasonic electricity is about 100 to 500 W/m 2 , preferably about 200 to 300 W/m 2 , i.e ⁇ the said power is given per unit of area of the filter plates 14a to be cleaned. It has been noticed that a suitable cleaning time, e.g., with suction dryers 10 that dewater dressed metal ores is about 1 hour once in a week, so that the amount of ultrasonic energy to be used at one time of cleaning is of an order of about 0.1 to 0.5 kWh/m 2 .
- the ultrasonic generator 32 may be arranged dis- placeable and the ultrasonic detectors 30 be mounted permanently on the bottom of the basins 12 of the suction dryers 10.
- the cleaning with ultrasonic intensification is carried out so that the ultrasonic generator 32 is brought to the suction dryer 10 to be cleaned and the plug of the conductor 31 is inserted into the socket 3a, and the cleaning is carried out either by means of the control unit 33 or by manual control.
- ultrasonic clean- ing can be arranged automatically, e.g., so that one ultrasonic generator 32 is connected by the intermediate of a multiplexor (not shown) alternatingly to the various suction dryers 10 to be cleaned, in which said devices the other necessary operations, such as supply of washing water into the suspension basin 12 and re ⁇ circulation of the cleaning water back through the filter plates 14a , take place by means of the control unit 33 by automatic control or, in the necessary respects, by manual control.
- the various details of the in ⁇ vention may show variation and differ from the details described above for the sake of example only.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Networks Using Active Elements (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP88902486A EP0309502B1 (en) | 1987-04-16 | 1988-02-29 | Method for the cleaning of the filter plates in a suction dryer |
BR888806900A BR8806900A (en) | 1987-04-16 | 1988-02-29 | METHOD FOR CLEANING FILTER PLATES IN A SUCTION DRYER |
DE3853706T DE3853706T2 (en) | 1987-04-16 | 1988-02-29 | CLEANING METHOD OF FILTER PLATES IN A SUCTION DRYER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI871706A FI76705C (en) | 1987-04-16 | 1987-04-16 | FOERFARANDE FOER RENGOERING AV FILTERPLATTOR FOER SUGTORKANORDNING. |
FI871706 | 1987-04-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988007887A1 true WO1988007887A1 (en) | 1988-10-20 |
Family
ID=8524342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1988/000032 WO1988007887A1 (en) | 1987-04-16 | 1988-02-29 | Method for the cleaning of the filter plates in a suction dryer |
Country Status (11)
Country | Link |
---|---|
US (1) | US4946602A (en) |
EP (1) | EP0309502B1 (en) |
JP (1) | JP2536914B2 (en) |
AT (1) | ATE121964T1 (en) |
AU (1) | AU603880B2 (en) |
BR (1) | BR8806900A (en) |
CA (1) | CA1308334C (en) |
DE (1) | DE3853706T2 (en) |
ES (1) | ES2007202A6 (en) |
FI (1) | FI76705C (en) |
WO (1) | WO1988007887A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4995991A (en) * | 1988-03-22 | 1991-02-26 | Ahlstrom Corporation | Method and apparatus for improving the operation of a disc filter |
WO1991018660A1 (en) * | 1990-06-04 | 1991-12-12 | Ecc International Inc. | Method for producing high solids slurries of clay water products |
AU624517B2 (en) * | 1989-06-29 | 1992-06-11 | Outokumpu Oy | Method for cleaning the filter plates of a suction drier |
US5213687A (en) * | 1990-06-04 | 1993-05-25 | Ecc International Inc. | Apparatus for filtering mineral slurries |
EP0545934A1 (en) * | 1990-08-30 | 1993-06-16 | Henry Filters Inc | Filter apparatus for machine tool coolant. |
US5223155A (en) * | 1990-06-04 | 1993-06-29 | Ecc International Inc. | Method for filtering mineral slurries |
WO1994025140A1 (en) * | 1993-05-05 | 1994-11-10 | Harry Nilsson | Rotating filter |
EP0682970A3 (en) * | 1994-04-19 | 1996-07-17 | Outokumpu Mintec Oy | Method and apparatus for cleaning the filter medium in a suction dryer. |
WO2005035096A1 (en) * | 2003-10-13 | 2005-04-21 | Larox Oyj | Method and apparatus for cleaning of a filter plate |
WO2016097481A1 (en) * | 2014-12-16 | 2016-06-23 | Outotec (Finland) Oy | An ultrasonic cleaning unit and a filter apparatus comprising the ultrasonic cleaning unit |
CN115554759A (en) * | 2022-11-04 | 2023-01-03 | 广州果范食品有限公司 | Multi-layer cake slurry filtering structure |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3927769C1 (en) * | 1989-08-23 | 1990-11-22 | Werner & Pfleiderer Gmbh, 7000 Stuttgart, De | |
JPH07503650A (en) * | 1992-01-22 | 1995-04-20 | アイメリーズ ピグメンツ,インコーポレーテッド | Mineral slurry filtration equipment |
DK89192A (en) * | 1992-07-07 | 1994-01-08 | Reson System As | Integrated cleaning system for especially simultaneous rotating and machining drum volumes |
JPH07313850A (en) * | 1994-05-30 | 1995-12-05 | Kubota Corp | Method for backward washing immersion-type ceramic membrane separator |
US5770092A (en) * | 1994-06-15 | 1998-06-23 | Solar Dynamics Ltd. | Apparatus and method for purifying water |
DE4422503A1 (en) * | 1994-06-28 | 1996-01-04 | Kloeckner Humboldt Deutz Ag | Sepn. of solids, e.g. coal particles, from fluid suspension |
GB2292098B (en) * | 1994-08-12 | 1998-04-29 | Kevin Miller | Cleaning of filters |
FI943809A (en) * | 1994-08-19 | 1996-02-20 | Outokumpu Mintec Oy | filter media |
US5791495A (en) * | 1996-03-11 | 1998-08-11 | Beloit Technologies, Inc. | Paper pulp screen cylinder |
FI104412B (en) | 1996-10-17 | 2000-01-31 | Outokumpu Oy | Method and apparatus for cleaning a filter surface |
AU9487998A (en) * | 1997-09-19 | 1999-04-12 | Baker Hughes Incorporated | Method and apparatus for monitoring, controlling and operating rotary drum filters |
FR2768941B1 (en) * | 1997-09-26 | 1999-12-24 | Eif | DEVICE AGAINST THE FILTERING OF A FILTER |
US6221255B1 (en) | 1998-01-26 | 2001-04-24 | Achyut R. Vadoothker | Ultrasound-assisted filtration system |
FI103717B1 (en) * | 1998-01-29 | 1999-08-31 | Andritz Patentverwaltung | A device for removing bark from a stream of wood containing bark and bark |
FI111810B (en) * | 1998-06-05 | 2003-09-30 | Outokumpu Oy | Method for enhancing drying |
FI111811B (en) * | 1998-06-05 | 2003-09-30 | Outokumpu Oy | Procedure for effective drying |
FI105322B (en) | 1998-06-25 | 2000-07-31 | Outokumpu Oy | Method of forming a filter cake |
DE19829916B4 (en) * | 1998-07-06 | 2005-03-24 | Envica Gmbh | Process for the regeneration of catalysts and regenerated catalysts |
US6939398B2 (en) * | 2002-09-19 | 2005-09-06 | Jacob Gorbulsky | Drum scrubber |
CN1978028B (en) * | 2005-12-09 | 2010-09-08 | 安徽铜都特种环保设备股份有限公司 | On-line circulated washing method of ceramic filter |
FI20060513A0 (en) * | 2006-05-24 | 2006-05-24 | Valtion Teknillinen | Sampling method |
EP1961475B1 (en) * | 2007-02-21 | 2020-06-17 | Veolia Water Solutions & Technologies Support | High pressure cleaning device |
KR100812791B1 (en) | 2007-11-20 | 2008-03-12 | 주식회사 유천엔바이로 | Disc fillter |
FI20080281L (en) * | 2008-04-11 | 2009-10-12 | Larox Oyj | Liquid removal filter and procedure for its cleaning |
CN102188852B (en) * | 2011-05-09 | 2013-02-13 | 烟台桑尼核星环保设备有限公司 | Rotating-disc type ultrasonic self-cleaning microstrainer |
WO2017092777A1 (en) * | 2015-12-03 | 2017-06-08 | Kronos International, Inc. | Method and device for improved solid-liquid filtration of filter cakes |
CN106984093A (en) * | 2017-06-02 | 2017-07-28 | 江苏元升厨卫电器有限公司 | Self-cleaning ultrasonic water purifier |
US11000791B2 (en) * | 2019-03-06 | 2021-05-11 | Veolia Water Solutions & Technologies Support | Rotary disc filter having backwash guides |
KR102404899B1 (en) * | 2021-07-27 | 2022-06-07 | 주식회사 그레넥스 | Back wash device for fabric filtration apparatus |
CN113751418A (en) * | 2021-09-22 | 2021-12-07 | 康硕(德阳)智能制造有限公司 | 3D prints ceramic idiosome ultrasonic cleaning device |
FI20225027A1 (en) * | 2022-01-13 | 2023-07-14 | Roxia Oy | A rotary vacuum disc filter apparatus, a method for cleaning filter discs of a rotary vacuum disc filter apparatus and a data storage medium |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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GB1168580A (en) * | 1967-08-15 | 1969-10-29 | Fmc Corp | Clarification of Liquids |
US4582077A (en) * | 1983-08-22 | 1986-04-15 | Skoda, Koncernovy Podnik | Arrangement for cleaning of objects by means of a close ultrasonic field |
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-
1987
- 1987-04-16 FI FI871706A patent/FI76705C/en not_active IP Right Cessation
-
1988
- 1988-02-29 AT AT88902486T patent/ATE121964T1/en not_active IP Right Cessation
- 1988-02-29 DE DE3853706T patent/DE3853706T2/en not_active Expired - Fee Related
- 1988-02-29 EP EP88902486A patent/EP0309502B1/en not_active Expired - Lifetime
- 1988-02-29 JP JP63502440A patent/JP2536914B2/en not_active Expired - Lifetime
- 1988-02-29 BR BR888806900A patent/BR8806900A/en not_active IP Right Cessation
- 1988-02-29 WO PCT/FI1988/000032 patent/WO1988007887A1/en active IP Right Grant
- 1988-02-29 AU AU14216/88A patent/AU603880B2/en not_active Ceased
- 1988-04-15 ES ES8801179A patent/ES2007202A6/en not_active Expired
- 1988-04-15 CA CA000564280A patent/CA1308334C/en not_active Expired - Lifetime
- 1988-11-21 US US07/278,536 patent/US4946602A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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GB1168580A (en) * | 1967-08-15 | 1969-10-29 | Fmc Corp | Clarification of Liquids |
US4582077A (en) * | 1983-08-22 | 1986-04-15 | Skoda, Koncernovy Podnik | Arrangement for cleaning of objects by means of a close ultrasonic field |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4995991A (en) * | 1988-03-22 | 1991-02-26 | Ahlstrom Corporation | Method and apparatus for improving the operation of a disc filter |
AU624517B2 (en) * | 1989-06-29 | 1992-06-11 | Outokumpu Oy | Method for cleaning the filter plates of a suction drier |
AU649047B2 (en) * | 1990-06-04 | 1994-05-12 | Ecc International Inc. | Method for producing high solids slurries of clay water products |
EP0532633B1 (en) * | 1990-06-04 | 1996-03-13 | Ecc International Inc. | Method for producing high solids slurries of clay water products |
US5213687A (en) * | 1990-06-04 | 1993-05-25 | Ecc International Inc. | Apparatus for filtering mineral slurries |
US5223155A (en) * | 1990-06-04 | 1993-06-29 | Ecc International Inc. | Method for filtering mineral slurries |
WO1991018660A1 (en) * | 1990-06-04 | 1991-12-12 | Ecc International Inc. | Method for producing high solids slurries of clay water products |
US5098583A (en) * | 1990-06-04 | 1992-03-24 | Ecc America Inc. | Method for producing high solids slurries of clay water products |
EP0545934A1 (en) * | 1990-08-30 | 1993-06-16 | Henry Filters Inc | Filter apparatus for machine tool coolant. |
EP0545934A4 (en) * | 1990-08-30 | 1993-07-21 | Henry Filters, Inc. | Filter apparatus for machine tool coolant |
WO1994025140A1 (en) * | 1993-05-05 | 1994-11-10 | Harry Nilsson | Rotating filter |
EP0682970A3 (en) * | 1994-04-19 | 1996-07-17 | Outokumpu Mintec Oy | Method and apparatus for cleaning the filter medium in a suction dryer. |
AU683988B2 (en) * | 1994-04-19 | 1997-11-27 | Outokumpu Mintec Oy | Method and apparatus for cleaning the filter medium in a suction dryer |
WO2005035096A1 (en) * | 2003-10-13 | 2005-04-21 | Larox Oyj | Method and apparatus for cleaning of a filter plate |
WO2016097481A1 (en) * | 2014-12-16 | 2016-06-23 | Outotec (Finland) Oy | An ultrasonic cleaning unit and a filter apparatus comprising the ultrasonic cleaning unit |
CN115554759A (en) * | 2022-11-04 | 2023-01-03 | 广州果范食品有限公司 | Multi-layer cake slurry filtering structure |
Also Published As
Publication number | Publication date |
---|---|
JP2536914B2 (en) | 1996-09-25 |
ATE121964T1 (en) | 1995-05-15 |
FI871706A0 (en) | 1987-04-16 |
EP0309502B1 (en) | 1995-05-03 |
FI76705B (en) | 1988-08-31 |
ES2007202A6 (en) | 1989-06-01 |
CA1308334C (en) | 1992-10-06 |
FI76705C (en) | 1988-12-12 |
DE3853706D1 (en) | 1995-06-08 |
AU603880B2 (en) | 1990-11-29 |
BR8806900A (en) | 1989-10-31 |
US4946602A (en) | 1990-08-07 |
JPH01503452A (en) | 1989-11-22 |
EP0309502A1 (en) | 1989-04-05 |
AU1421688A (en) | 1988-11-04 |
DE3853706T2 (en) | 1995-09-14 |
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